diff --git a/docs/wasm-runtime-architecture.md b/docs/wasm-runtime-architecture.md
index 16a7d78..6143bae 100644
--- a/docs/wasm-runtime-architecture.md
+++ b/docs/wasm-runtime-architecture.md
@@ -131,6 +131,12 @@ available. If an artifact is cold or stale, dispatch compiles it on demand via
 Workers identify cached unit artifacts by nanosecond mtime, ctime, and size.
 Whole-second mtime alone is insufficient because a dependency-triggered rebuild
 can replace a wasm artifact within the same second as its prior build.
+The worker also classifies each compiled module's immutable import descriptors
+once when that artifact enters the module cache. Each request still creates its
+own import vector, memory/table-base globals, GOT globals and function-table
+slots, then runs relocations, constructors, and request-pointer binding. This
+removes repeated Wasmtime import-type traversal without sharing request state or
+changing core-first, unit-load-order symbol resolution.
 Cold module compilation and deserialization are host work, so `load_unit()`
 refreshes the epoch deadline before its first guest call. Otherwise a component
 whose compilation outlasted the guest CPU budget would immediately trap in the